// Copyright 2017 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"go/parser"
	"go/token"
)

func extractPackage(fname string) (string, error) {
	fset := token.NewFileSet()
	f, err := parser.ParseFile(fset, fname, nil, parser.PackageClauseOnly)
	if err != nil {
		return "", err
	}
	return f.Name.String(), nil
}
